Lithium ion batteries with high energy density, excellent cycling capability and low internal impedance
View Patent ↗Batteries with particularly high energy capacity and low internal impedance have been described herein. The batteries can exhibit extraordinary long cycling with acceptable low amounts of fade. Pouch batteries using high specific capacity lithium rich metal oxide as positive electrode material combined with graphitic carbon anode can reach an energy density of at least about 180 Wh/kg at a rate of C/3 from 4.35V to 2V at room temperature while having a room temperature areas specific DC resistance of no more than about 75 ohms-cm 2 at 20% SOC based on a full charge to 4.35V. High specific capacity lithium rich metal oxide with specific stoichiometry ranges used in these batteries are disclosed.
1. A secondary lithium ion battery comprising a carbon based negative electrode, a positive electrode comprising Li 1+b Ni α Mn β Co γ A δ O 2 with 0.065≦b≦0.0895, 0.225≦α≦0.35, 0.35≦β≦0.45, 0.15≦γ≦0.3, 0≦δ≦0.05, where A is a metal different from lithium, nickel, manganese and cobalt, and up to five mole percent of the oxygen can be replaced with a fluorine dopant, a separator between the negative electrode and the positive electrode and an electrolyte comprising lithium ions, the positive electrode having an active material density from about 2 g/mL to about 4 g/mL and a total thickness from about 45 microns to about 200 microns and having a specific capacity of at least about 205 mAh/g cycled against lithium from 4.6V to 2V at a rate of C/10 at room temperature based on the weight of the positive electrode active material, and wherein the battery has a room temperature DC resistance of no more than about 80 ohms-cm 2 at 20% SOC based on a full charge to 4.35V.
2. The secondary lithium ion battery of claim 1 having a room temperature DC resistance that does not change by more than a factor of 5 between the lowest value and the largest value over a range of state of charge from 10% to 90% with a full charge voltage of 4.35V.
3. The lithium ion secondary battery of claim 1 having a room temperature DC resistance that does not change by more than a factor of 4 between the lowest value and the largest value over a range of state of charge from 10% to 90% with a full charge voltage of 4.35V.
4. The lithium ion secondary battery of claim 1 wherein A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, or combinations thereof and 0.065≦b≦0.0895, and wherein the battery has a room temperature areas specific DC resistance is no more than about 75 ohms-cm 2 at 20% SOC based on a full charge to 4.35V.
5. The lithium ion secondary battery of claim 1 wherein the battery exhibits an energy density of at least about 180 Wh/kg at a rate of C/3 from 4.35V to 2V at room temperature.
6. The lithium ion secondary battery of claim 1 wherein the battery is a pouch battery comprising a pouch cell enclosure enclosing the electrodes, electrolyte and separator with electrically conductive tabs extending from the enclosure with respective electrical connections with the current collectors.
7. A secondary lithium ion battery comprising a carbon based negative electrode, a positive electrode comprising Li 1+b Ni α Mn β Co γ A δ O 2 with 0.05≦b≦0.125, 0.225≦α≦0.35, 0.35≦β≦0.45, 0.15≦γ≦0.3, 0≦δ≦0.05, where A is a metal different from lithium, nickel, manganese and cobalt, and up to five mole percent of the oxygen can be replaced with a fluorine dopant, a separator between the negative electrode and the positive electrode and an electrolyte comprising lithium ions, the positive electrode having an active material density from about 2 g/mL to about 4 g/mL and a total thickness from about 45 microns to about 200 microns and having a specific capacity of at least about 205 mAh/g cycled against lithium from 4.6V to 2V at a rate of C/10 at room temperature based on the weight of the positive electrode active material, wherein the battery has a room temperature DC resistance that does not change by more than a factor of 5 between the lowest value and the largest value over a range of state of charge from 10% to 90% with a frill charge voltage of 4.35V and wherein the battery has a room temperature discharge specific energy of at least about 185 Wh/kg at a discharge rate of C/3 from 4.35V to 2V.
8. A secondary lithium ion battery comprising a positive electrode comprising a high specific capacity lithium rich metal oxide, a negative electrode comprising graphitic carbon, a separator between the positive electrode and the negative electrode, current collectors respectively associated with the positive electrode and the negative electrode, electrolyte comprising lithium ions dissolved in a nonaqueous solvent, and a pouch cell enclosure enclosing the electrodes, electrolyte and separator with electrically conductive tabs extending from the enclosure with respective electrical connections with the current collectors,
wherein the high specific capacity lithium rich metal oxide is approximately represented by the formula Li 1+b Ni α Mn β Co γ A δ O 2 with 0.05≦b≦0.125, 0.225≦α≦0.35, 0.35≦β≦0.45, 0.15≦γ≦0.3, 0≦δ≦0.05, where A is a metal different from lithium, nickel, manganese and cobalt, and up to five mole percent of the oxygen can be replaced with a fluorine dopant, and
wherein the battery has a room temperature discharge specific energy of at least about 185 Wh/kg at a discharge rate of C/3 from 4.35V to 2V and wherein the battery capacity decreases by no more than about 20% from the 5 th cycle to the 1000 th cycle when cycled at room temperature from 4.24V to 2.73V at a rate of C/3.
9. The secondary lithium ion battery of claim 8 wherein the average voltage of the battery decreases by no more than about 8% from the 5 th cycle to the 1000 th cycle when cycled at room temperature from 4.24V to 2.73V at a rate of C/3.
10. The secondary lithium ion battery of claim 8 wherein the battery capacity decreases by no more than about 15% from the 5 th cycle to the 1000 th cycle when cycled at room temperature from 4.24V to 2.73V at a rate of C/3.
11. The secondary lithium ion battery of claim 8 wherein a room temperature DC electrical resistance does not change by more than a factor of 5 between the lowest value and the highest value over a range of state of charge from 10% to 90% with a full charge voltage of 4.35V.
12. The secondary lithium ion battery of claim 8 wherein 0.065≦b≦0.0895.
13. The secondary lithium ion battery of claim 8 wherein 0.23≦α≦0.34, 0.36≦β0.445, 0.15≦γ≦0.29, and wherein A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, or combinations thereof.
14. The secondary lithium ion battery of claim 8 wherein A is magnesium and 0.01≦δ≦0.0375.
15. The secondary lithium ion battery of claim 8 wherein b+α+β+γ+δ is approximately equal to 1.
16. The secondary lithium ion battery of claim 8 wherein the negative electrode comprises graphitic carbon.
17. The secondary lithium ion battery of claim 8 wherein a room temperature DC resistance is no more than about 4 milli-ohms at 20% SOC based on a full charge to 4.35V.
18. The secondary lithium ion battery of claim 8 wherein the electrolyte comprises ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate.
19. The secondary lithium ion battery of claim 8 wherein the battery is a pouch battery having a discharge capacity of at least about 5 Ah discharged at a rate of C/10 from about 4.5V to about 1.5V.
20. The secondary lithium ion battery of claim 19 having a total of at least 5 positive electrode structures and at least one negative electrode structure for each positive electrode structure, each positive electrode structure and negative electrode structure comprising a metal current collector, wherein each positive electrode has an active material density from about 2 g/mL to about 4 g/mL and a total thickness from about 45 microns to about 200 microns and negative electrodes stacked between positive electrodes have an active material density 1.25 g/mL to about 2 g/mL and a total thickness form about 25 microns to about 200 microns.
21. The secondary lithium ion battery of claim 8 having a room temperature DC resistance that does not change by more than a factor of 4 between the lowest value and the largest value over a range of state of charge from 10% to 90% with a full charge voltage of 4.35V.
22. The secondary lithium battery of claim 8 wherein the positive electrode further comprises a non-active inorganic coating on the high specific capacity lithium rich metal oxide, wherein the coating comprises a metal halide or a metal oxide.
23. A lithium-based battery active material comprising a lithium rich metal oxide approximately represented by the formula Li 1+b Ni α Mn β Co γ A δ O 2 with 0.065≦b≦0.0895, 0.225≦α≦0.35, 0.35≦β≦0.45, 0.15≦γ≦0.3, 0≦δ≦0.05, where A is a metal different from lithium, nickel, manganese and cobalt, and up to five mole percent of the oxygen can be replaced with a fluorine dopant, wherein the material has a specific discharge capacity of at least about 200 mAh/g cycled against lithium from 4.6V to 2V at a rate of C/10 at room temperature based on the weight of the positive electrode active material discharged against lithium.
24. The lithium-based battery active material of claim 23 wherein 0.072≦b≦0.08.
25. The lithium-based battery active material of claim 23 wherein 0.072≦b≦0.089.
26. The lithium-based battery active material of claim 23 wherein 0.23≦α≦0.34, 0.36≦β≦0.445, 0.15≦γ≦0.29, 0≦δ≦0.04, and wherein A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, or combinations thereof.
27. The lithium-based battery active material of claim 23 wherein 0.24≦α≦0.33, 0.38≦β≦0.4425, 0.15≦γ≦0.275, 0≦δ≦0.0375, and wherein A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, or combinations thereof.
28. The lithium-based battery active material of claim 23 further comprising a non-active inorganic coating.
29. The lithium-based battery active material of claim 28 wherein the coating comprises a metal halide or a metal oxide.
30. The lithium-based battery active material of claim 23 wherein b+α+β+γ+δ is approximately equal to 1.
31. A secondary lithium ion battery comprising a positive electrode comprising a high specific capacity lithium rich metal oxide, a negative electrode comprising graphitic carbon, a separator between the positive electrode and the negative electrode, current collectors respectively associated with the positive electrode and the negative electrode, electrolyte comprising lithium ions dissolved in a nonaqueous solvent, and a pouch cell enclosure enclosing the electrodes, electrolyte and separator with electrically conductive tabs extending from the enclosure with respective electrical connections with the current collectors,
wherein the high specific capacity lithium rich metal oxide is approximately represented by the formula Li 1+b Ni α Mn β Co γ A δ O 2 with 0.05≦b≦0.125, 0.225≦α≦0.35, 0.35≦β≦0.45, 0.15≦γ≦0.3, 0≦δ≦0.05, where A is a metal different from lithium, nickel, manganese and cobalt, and up to five mole percent of the oxygen can be replaced with a fluorine dopant, and
wherein the battery has a room temperature discharge specific energy of at least about 160 Wh/kg at a discharge rate of C/3 from 4.35V to 2V and wherein the battery capacity decreases by no more than about 35% from the 5 th cycle to the 5000 th cycle when cycled at room temperature from 4.24V to 2.73V at a rate of C/3.
32. The secondary lithium battery of claim 31 wherein the positive electrode further comprises a non-active inorganic coating on the high specific capacity lithium rich metal oxide, wherein the coating comprises a metal halide or a metal oxide.